Grinding machine



M. O. REEVES.-

GRINDING MACHINE. APPLICATION FILED JAN.26, I920. 1,480,?54.. Patented0ct.3,1922.

2 SHEETSSHEET 2 g g/071110111 4 85k I (Ill 'IIIIIII/ Patented Uct. 3,1922.

STATES PATENT OFFICE.

MILTON O. REEVES, OF COLUMBUS, INDIANA, ASSIGNOR T0 REEVES PULLEY (10.,0F COLUMBUS, INDIANA, A CORPORATION OF INDIANA.

GRINDING MACHINE.

Application filed January 26, 1920. Serial No. 354,079.

T 0 all whom it may concern Be it knownthat I. MILTON O. REEVES, acitizen of the United States. residing at Columbus. in the county ofBartholomew and State of Indiana. have invented a new and usefulGrinding Machine, of which the following is a specification.

Itis the object of my invention to provide a grinding machine foraccurately grinding round articles. of any size, especially where thearticles are conical or partly cylindrical and partly conical. Moreparticularly, it is the object to withdraw endwise from the entrance endof the grinding throat the articles being ground, which entrance endisthe larger if the articles have conical surfaces, against the normalfeeding action on such articles if the machine is set to produce suchaction.

My present invention is in some respects based on that set forth in myprior Patent No. 1,261,129, granted April 23, 1918; and embodies somefeatures in common with m co-pending applications Ser. Nos. 298,00 and298,008, both filed May 19, 1919.

The accompanying drawings illustrate my invent-ion: In such drawings, Fi1 is a front elevation of a grinding mac ine embodying my invention;Fig. 2 is a section on the line 2-2of FigIl; Fig. 3 is a partial plan.of the mechanism at the inding throat; Fig. 4 is a section on the l1ne'14 of Fig. 3, looking in the opposite direction from Fig. 2; and Fig. 5is a section on the line 5-5 of Fig. 4.

On the base 10 are carried three adjustable frames 11. 12-, and 13, thefirst of which is adjustable vertically by an adjusting wheel 14 and theother two of which are independently adjustable longitudinally of thebase 10 by a crank'ie and a hand wheel 16' respectively. The frames 11and 12 are arranged to be clamped in adjusted position by suitableclamping screws 17 and 18 re spectively. The vertically adjustable frame11 carries a longitudinally extending hori zontal shaft 19, which at itsend toward the frame 12 has mounted thereon a wheel 20, preferably anabrasive wheel, which on one end has an annular .face 21. The wheel 20is the feed'wheel, and in the grinding opera tion is driven atcomparatively slow speed 1n the direction of the arrow. Thelongitudinally adjustable frame 12 is adjustable toward and from thefeed wheel 20 by the crank 15, and for accuracy for adjustment, to takeup all lost mot-ion, is associated with a weight 15 which tends to moveit away from the feed wheel and so holds it to one limit of the lostmotion which would otherw se be permitted by its adjusting mechanlsm.This frame 12 carries a horizontal shaft 22, transverse to the directionof ad ust-ment of such frame and to the shaft 19. The shafts 19 and 22are driven in any suitable way which allows the adjustment of the frames11 and 12; but asthis driv ng arrangement is no part of the presentinvention it is unnecessary to show it or describe it in detail. Theshaft 22 carries an abrasive wheel 23. having a peripheral grindingface24, and is driven at comparatlvely high speed in the direction ofthe arrow. The abrasive wheel 23 is the grinding wheel. The peripheralface 24: of the grinding wheel 23 where it moves downward opposes theannular working face 21 of the feed wheel 20 where it moves upward, toprovide between them a grinding throat in which the grinding of theround articles 25 occurs. The width of this grinding throat isadjustable by shifting the frame 12 by the crank 15. The narrow point ofthe grinding throat is in the horizontal plane through the axis of thegrinding wheel 23 when the face 21 is flat and vertical, as I usuallyhave it, as such plane is then perpendicular to the working face 21 of.the feed wheel 20 at the grinding throat. The height of the shaft 19with respect to this horizontal plane is adjustable by the I it possibleto grind articles either cylindrical or conical as desired.

.'The round articles 25 to be ground are supported in the grindingthroat on a feed bar 30, which is carried by the longltudinallyadjustable frame 13, on which .both ends of the feed bar are supported.To obtain this support, the frame 13 is in the shape of an invertedhorse-shoe, as is aparent from Fig. 2. The feed bar, as shown, 1sclamped to one face of the frame 13 -by clamping bolts 31 extendingthrough vertical slots 32 in the feed bar; and it rests at both ends ontemper screws 33 so that by the adjustment of such screws the feed barmay be vertically adjusted relatively to the grinding throat, to bringthe axes of the articles to be ground substantially into the plane ofthe narrow point of the grinding throat, the feed bar when adjustedbeing clamped in adjusted position byxthe bolts 31. The feed bar may bemade ina single piece, such as for the sake of simplicity is shown inthe drawings; or may have any desired removable and replaceable andadjustable parts,

such as some or all of those set forth in my aforesaid co-pendingapplication Ser. No. 298,007, or anydesired mounting, such for instanceas that shown in my aforesaid copending application .Ser. No. 298,008.

In order tov limit the movement of the articles 25 in one directionalong the grinding throat, as shown toward the back of the machine,,astop plate 40 is slidably" mounted on the upper edge of the feed bar 30.This stop plate is provided with longitudinal slots 41, through whichextend guide bolts 42 which may be set into any of a seriesof holes 43in an upwardly projecting plate 44 suitably fastened to one side of thefeed bar 30, as by screws 45.- A pin 46 projects from the stop plate '40through a slot 47 in the plate 44, and between this pin and the rear endofrthe feed bar 30 extends a tension spring 48 which tends to move thestop plate 40 backward. This backward movement of the stop plate 40 islimited by a stop screw 49, carried by and adjustable in a smallupwardly extending plate 50 which may be attached by bolts 51 to thefeed bar 30 at any desiredpoint along a series of holes 52 prbperlyspaced to receive such screws. A forwardly projecting rod 53 is alsoattached to the pin 46, and is provided -with a handle at its forwardend, so that by pulling suchhandle the stop plate '40 may be drawnforward against the action of the spring 48, but will be returned bysuch spring into engagement with the stop screw when such handle isreleased. The stop plate 40 limits the movement towardthe backof themachine of an article to be ground, and by pulling such stop plateforward by the handle 53 such article may be ejected at the forward orentrance end of the grinding throat, The article may be allowed toproject out of the rear end of the grinding throat to any desiredextent, by proper setting of the screws 42, 51, and 49.

The vertically adjustable frame 11 and the longitudinally adjustableframe 12 are provided with suitable dressing devices 60 and 61respectively, for dressing the working surfaces 21 and 24 of the wheels20 and 23 for any positions of such frames, so that such dressing may bedone without disturbing the adjustment of such wheels. Each of thesedressing devices comprises a cutting diamond 62, carried in a suitablemovable frame 63 so that the depth of cut may be adjusted by anadjusting screw 64 and the movable frame 63 may be moved along asuitable slideway 65 by a hand wheel 66 to cause the cutting diamond totravel across the face 21 or 24 to true it. The angle of one or both ofthe slideways 65 may be made adjustable in relation to the axis of theassociated wheel. As shown the slideway 65 for the grinding wheel 23 isso adjustable. This adjustability may be obtained in various ways, butis shown as being obtained by mounting the adjustable slideway 65 ateachend on a supporting bar 67 by screws 68 provided with lock nuts andextending from theslideway 65 through the support- -ing bar 67, anda'push screw 69 located between the two screws 68 and acting to push theassociated end of the slideway 65 away from its supporting bar 67. Bymanipulating the screws 68 and 69, either or both ends of the slideways65 may be pushed away from its supporting bar by a controlled dis tance,and yet held firmly, though preferably only one end is so pushed awaywhile the other end is held tight against such supporting bar. Thisadjustment of the screws 68 .and 69 adjusts the angle between the slide-In operation, the articles to be ground are fed into the grinding throatin any suitable manner, whichv may be by placing them manually on thefeed bar 30 and pushing -them'forward until they are caught'by thesurfaces 21 and 24. When such an article is so caught, it is slowlyrotated by the action of the feed wheel 20 and ground to true groundform by the grinding wheel 23 as it rotates. In addition to itsrotation, I preferably give the article 25 a. forward feeding movementthrough the grinding throat, from the outside toward the center of thefeed wheel 20, by having the axis of such feed wheel slightly lower thanthe axis of the article being ground, so that such article in additionto' being rotated is moved along its axis by the action thereupon offeed wheel. The rate of feeding movement is controlled by varying theheight of the axis of the feed wheel 20, by proper manipulation of thehand wheel 14. This feeding movement is due to the fact that when theaxis of the feed wheel 20 is below the horizontal plane of the grindingthroat, the movement of the face 21 at such horizontal plane, where itoperates on the article 25, has a slight componentqlengthwise of thethroat, and this lengt-hwisecomponent feeds the article along thethroat. U By this feeding action, an article 25 is fed through thegrinding throat, and across the face 24:, until it is stopped byengagement with the stop plateO. Then by pulling such stop plate forwardby the rod 53, the article 25 being ground is shoved backward out of thegrinding throat at the entrance end, and may be removed from the feedbanin any suitable manner. The stop plate is set to stop the article 25at any desired point, either with or without a part protruding from therear end of the grinding throat. Any such protruding part at the rearend of the throat will of course be cylindricah.

but the part which is in the grinding throat may be cylindrical orconical, and my present invention is particularly applicable where it isdesired to have it conical; The angle of the cone is controlled by theangular setting of the slideway of the dressing device 61, and thedressing of the face 24 .thereby, to get the desired angle between thefaces 21 and 2d at the grinding throat. In this way it ispossible togrind either conical articles, or articles which are partly conical buthave a cylindrical portion at the smaller end of the cone; and in eithercase the conical portions may have at their larger ends portions ofvarious shapes which are not allowed to enter the grinding threat. Thelength of the cylinder at the smaller end of the cone may be varied bychanging the setting of the stop plate 40. When such cylindricalportions are provided at the smaller endsof the cones. the upper surfaceI of the feed bar 30 over which such protruding cylindrical portions liemust of' course be cut away, as indicated at 30',to

prevent displacement of the axes of the articles being ground.

I claim as my invention: 1. In a grinding machine, the combination of agrinding wheel, a feed wheel, said two wheels forming a grinding throatbetween them for grinding round articles therein,

means for supporting articles to be ground in said throat. and aforwardly movable stop member for limiting the movement of articles atthe rear of said grinding throat and pushing them toward the front ofsaid throat.

2. In a grinding machine, the combination of a grindin wheel, a feedwheel, said two wheels formlng a grinding throat between them forgrinding round articles therein,

means for supporting articles to be ground in said throat, a forwardlymovable stop member for limiting the movement of articles at the rear ofsaid grinding throat and pushing them toward the front of said throat,and means accessible from the front and adjust-able means for limitingthe rear-- ward movement of said stop member.

4:. In a grindingmachine, the combina-v tion of a grinding wheel, a feedwheel, said two wheels forming a grinding throat between them forgrinding round articles therein, means for supporting articles to beground in said throat, a forwardly movable stop member for limiting themovement of articles at the rear of said grinding throat and pushingthem toward the front of said throat, and a spring tending to move saidstop member rearwardly.

5. In a grinding machine, the combination of a grinding wheel, a feedwheel, said two wheels forming a grinding throat between them forgrinding round articles therein, means for supporting articles to beground in said throat, a forwardly movable stop 'member for limiting themovement of articles at the rear of said grinding throat. and pushingthem toward the front of said throat, and means for varying the angleformed by the working faces of said wheels at said throat.

6. In a grinding machine, the combination of a grindin wheel having aperipheral grinding suace, a feed wheel having an annular end surface,said two wheels being arranged so that their working surfaces opposeeach other at one point to form a grinding throat, a feed bar forsupporting articles to be ground in said throat, and a stop member forlimiting the movement of articles along said throat in one direction,said stop member being movable in the other direction to force saidarticles in the latter direction along said throat. i

7. In a grinding machine, the combination of a grinding wheel having aperipheral grinding surface, a. feed wheel having an annular endsurface, said two wheels being arranged so that their'working surfacesoppose each other at one point to form a grinding throat, a feed bar forsupporting articles to be ground in said throat, a stop member forimiting the movement of articles along said throat in one direction,said stop member bein movable in the other direction to 7 force saidarticles in the latter direction along said throat, and means foradjustably limiting the movement of said stop member 10 day of January,"A. D. one thousand nine 15 hundred and nineteen.

MILToN' o. REEVES.

